Dissertationen zum Thema „Structures de sillage“
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Bonnier, Marion. „Sillage d'une sphère en milieu linéairement stratifié : caractérisation des structures tourbillonaires“. Toulouse, INPT, 1999. http://www.theses.fr/1999INPT023H.
Der volle Inhalt der QuelleArmaly, Majd. „Dynamics of coherent structures over wind turbine blade“. Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMR005.
Der volle Inhalt der QuelleThe primary objective of the thesis is to quantitatively assess the dynamic behavior of turbulent airflow around a NACA airfoil as a function of the upstream flow. The upstream flow consists of a family of coherent structures, each with its own distinct temporal and spatial scales. Additionally, this upstream flow may include a mean shear due to a large scale boundary layer. These situations are commonly encountered in wind and marine turbine farms, where the wake generated by one turbine becomes the upstream flow for the next one, and where the atmospheric boundary layer can influence the dynamics of the airfoil’s airflow. Aerodynamic research on wind turbines has primarily focused on the general response of airfoils, and the flow downstream. However, airfoils are not considered yet in an upstream flow with the presence of a family of coherent structures. This study takes into account the spatial and temporal aspects, which is crucial for understanding how efficiently the kinetic energy carried by these coherent motions is captured within the wake. The novelty of the project is to provide a complementary and more detailed analysis of the airfoil-upstream flow interactions based on the analysis of the intermittency of the upstream conditions. This helps to gain insights into the dynamic response ofthe downstream airfoil and the distribution of kinetic energy over the airfoil. To achieve this goal, pressure distributions (coherent structures) must be phase-averaged with a conditioning based on the dynamics of the upstream flow. This type of analysis representsa novel approach and requires the development of specialized methods to be applied to such complex cases. One of the key areas of investigation within the project is the study of the total turbulent kinetic energy (TKE) when the upstream coherent structure packets interact with the downstream airfoil. Additionally, further research can be involved into turbulent kinetic energy, considering the interactions between different components of fluctuations, such as the interactions between coherent and random motion. This thesis work is integrated in the framework of DYNEOL (ANR-17-CE06-0020) project that is funded by the French National Agency of Research (ANR). The project is a collaborative research involving four French laboratories, including the CORIA laboratory
Bourdet, Sébastien. „Analyse physique d'écoulements compressibles instationnaires autour de structures portantes dans le contexte d'interaction fluide-structure“. Toulouse, INPT, 2005. http://www.theses.fr/2005INPT004H.
Der volle Inhalt der QuelleA main objective of this thesis is the physical analysis by solving the Navier-Stokes equations of flows around an airfoil at zero incidence for a viscous compressible fluid in the subsonic and transonic regimes. For Mach numbers 0. 2-0. 4 and Reynolds 104 we have analysed the evolution of the von Kármán instability by means of the Landau model with use of Mach number as parameter. This instability is found to be triggered by the compressibility effect. This study allowed the evaluation of the critical Mach number for the appearance of this instability. The second part of the study consists of the development of a numerical code for the prediction of the fluid domain motion following the dynamic mesh variation. The pitching irfoils flows studied show a good agreement with the other studies. This work is a first step towards a fluid-structure interaction code
Marais, Catherine. „Dynamique tourbillonnaire dans le sillage d'un aileron oscillant : Propulsion par ailes battantes biomimétiques“. Phd thesis, Université Paris-Diderot - Paris VII, 2011. http://pastel.archives-ouvertes.fr/pastel-00584901.
Der volle Inhalt der QuelleThiesset, Fabien. „Exploration analytique et expérimentale des interactions cohérence-turbulence au sein d'un écoulement de sillage“. Phd thesis, Université de Rouen, 2011. http://tel.archives-ouvertes.fr/tel-00880987.
Der volle Inhalt der QuelleRehimi, Férid. „Caractérisation expérimentale des structures tourbillonnaires derrière un cylindre en milieu confiné par la PIV et la polarographie“. Nantes, 2006. http://www.theses.fr/2006NANT2023.
Der volle Inhalt der QuelleThis work deals with the experimental characterization of the vortex shedding from a circular cylinder between parallel walls. Two experimental measurement techniques were used for the investigation of the wake downstream the cylinder : the PIV (Images Particles Velocimetry) and the polarographic method, with circular probes mounted flush on one of the two parallel walls of the channel downstream from the obstacle. In parallel to this work, one developed a computational code for the inversion of the convection-diffusion equation, which is based on the sequential Beck algorithm, in order to determine the wall shear stress from the limiting current delivered by the probes. Its validation was carried out beforehand by measurements in a cone-plate rheometer. Thereafter, one studied the vortex shedding behind the circular cylinder by synchronized measurements between PIV and polarography. Measurements of PIV were used to characterize the various flow regimes, and to show the main differences between this case of the confined wake (for a blockage ratio of 1/3) and the case of the non-confined wake. Then, one studied the dynamic of vortex structures downstream the cylinder. The decomposition of the instantaneous velocity fields obtained by PIV in Proper Orthogonal Modes (POD) made it possible to follow their energetic distribution for the studied range of Reynolds numbers ( 50 ≤ Re ≤ 300 ). With this decomposition, it is possible to make an inhomogeneous filtering and to reconstitute filtered fields solved in time. Finally, a comparison between the results of PIV and of electrochemistry was carried out
Gunnoo, Hans. „Etudes des structures spatio-temporelles dans un sillage de mât conditionnées par l'action commune des vagues et des courants“. Thesis, Normandie, 2017. http://www.theses.fr/2017NORMC264/document.
Der volle Inhalt der QuelleThe various experiments carried out have laid emphasis on the study of hydrodynamic spatio-temporal structures found in an offshore wind turbine’s mast, coupled to a cylinder, which will later on be used at the Courseulles-sur-Mer wind farm. The hydrodynamic analysis focused on the synchronization phenomenon between regular waves and the Von Karman Street generated by a current, behind two different vertical cylinders. A diagram showing the different synchronization regimes with respect to the frequencies of the waves and the amplitudes studied, has been drawn. In addition to the results obtained with regular waves, the synchronization phenomenon has also been analysed using irregular waves. In the case of irregular waves, the phase diffusion coefficient, K, has been used to explain the different frequency synchronization observed. After having studied the synchronization phenomenon, tests were carried out on the study of sediment transport (scour and ripples) under the effect of different types of flows in an environment close to a vertical cylinder. In parallel to the laboratory experiments, a numerical study has also been conducted by studying the DNS (Direct Numerical Simulation) of a steady flow of current around a vertical cylinder. In addition to that a more complicated flow of a steady current around a network of cylinders comprising of a series of 4 cylinders arranged in 2 rows (representing a network of wind turbine masts) have also been observed and analysed. After having studied the flow made up by a steady current, the olafoam solver was used to apply a flow made up of both currents and waves in an obstacle free environment with a smooth floor. The numerical results obtained close to the free surface have been found to fairly agree with the findings of other related studies conducted. We observed a reduction in the intensity of the surface current when the waves and the current propagate in the same direction
Ruiz, Tony. „Analyse de l'interaction entre un sillage tridimensionnel et une paroi – Détection de structures cohérentes responsables de fluctuations de pression pariétale“. Phd thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aéronautique, 2009. http://tel.archives-ouvertes.fr/tel-00461293.
Der volle Inhalt der QuellePérard-Lecomte, Aude. „Caractérisation de la dispersion des polluants particulaires dans le sillage des poids lourds en milieu urbain“. Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0207.
Der volle Inhalt der QuelleRoad transportation is a major contributor to air quality pollution in urban areas, particularly in fine and ultrafine particles. These pollutants are harmful to human health, as they can worsen or cause lung and cardiovascular diseases. In this context, we are interested in the evolution of particles emitted from heavy truck exhausts, starting from their emission. The main objective of this thesis is to study the extent of particle dispersion emitted by heavy truck's exhausts, around and in the wake of heavy trucks. Numerical methods based on an Euler-Lagrange approach were used to simulate and characterize the airflow topology around the truck, using the Reynolds-Averaged Navier-Stokes (RANS) method for the fluid phase and a Lagrangian approach for the dispersed phase. These simulations were supported by wind tunnel measurements in the wake of a reduced-scale model of a heavy truck. Particle Image Velocimetry (PIV) was used for analyzing the air velocity fields, while the dispersion of ultrafine solid particles was characterized by measuring concentration fields using a granulometer. The truck's wake flow is completely detached at the rear of the trailer, revealing a recirculation zone mainly composed of a large vortex, coming from the under-trailer. Particles' dynamics appears to be dominated by turbulence and strongly correlated with vortical structures, especially in the wake of the truck. Indeed, particles tend to concentrate preferentially on the periphery of the main vortex formed behind the truck, as well as in areas of low turbulent intensity. The movement of most inertial particles (diameter > 2.5~mu m) is dominated by gravity, while turbulence is mainly responsible for the movement and deposition of the finest particles (diameter < 2.5~mu m). The position and orientation of the exhaust pipe also have a significant influence on the extent of dispersion and the distribution of particles in the underbody and in the wake of the heavy truck. Indeed, when particles are emitted from the under-trailer, most of them are concentrated in the recirculation zone, less than 1.85H away from the trailer (H being the height of the trailer), and at human height. On the other hand, the particles emitted on the top of the truck are very rarely re-entrained in the recirculation zone, and are mostly concentrated above it, at a height equivalent to 2.6~m (0,9H) above ground level. The exposure of populations to the particles emitted by heavy goods vehicles could therefore be sharply limited when the exhausts are released from top of the truck
Martinache, Clément. „Le printemps cosmique des grandes structures : Spitzer et la recherche de structures à z ~ 2 à haut taux de formation stellaire dans le sillage de Planck et Herschel“. Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS300/document.
Der volle Inhalt der QuelleGalaxies are beacons in the Universe that allow us to understand the evolution of the distribution matter in all its forms. The study of galaxies at different epochs helps to understand how they organize at large scales (greater than inter-galaxies distance) but also how they formed, and formed their stars.At our cosmic epoch, galaxies that reside in the densest environments (clusters, groups) have very different properties compared to galaxies residing in less dense environments. This bimodality between 1) elliptical galaxies, massive, old and forming little stars in dense environments on the one hand, and 2) of spiral galaxies, younger and experimenting intense star formation in less dense environments indicates different evolutionary mechanisms and formation mechanisms.The study of galaxies in clusters reveals that they probably experimented intense star formation at redshifts z ~ 2, and points to a synchronous episode of star formation in the galaxies in the cluster, and of colossal proportions (~ 500 solar masses per year, to be compared with the average rate of star formation observed in the local Universe in the order of ~ 1-10 solar masses per year). But this phase still lack a direct observational conclusion, although recent observations in this direction.One possible way to search for these objects is to try to detect their emission in the far infrared, which traces directly star formation. This is what has been achieved with the Planck satellite. From Planck / HFI data, a team in collaboration with us extracted 2151 cluster candidates experimenting an intense star formation phase. A follow-up of 228 candidates was made with the space telescope Herschel / SPIRE, and revealed overdensities of red sources, compatible with a redshift distribution peaking around z ~ 2, and star formation rates of approximately 700 masses solar year.To better constrain the redshift of these candidates, study their contents in terms of stars, another follow-up on 80 candidates was conducted using the IRAC instrument on the Spitzer Space Telescope. My work focuses on the analysis and interpretation of such data.The wavelengths of the IRAC instrument (3.6 and 4.5 microns) are indeed tailored to detect a characteristic peak emission of stellar populations, to estimate the redshift and the stellar mass.My work revealed overdensities of red IRAC sources (z> 1.3) at the positions of the red SPIRE sources (z ~ 2 ~ 700Msol.an SFR), compatible with clusters or proto-clusters in an intense star formation phase. Estimates of photometric redshifts and stellar mass show that these objects are compatible with the progenitors of local clusters.These candidates, however, require confirmation, especially with obtaining spectroscopic redshifts. This work has already begun, and two candidates have already been confirmed at redshifts of 2.15 and 2.36 using the 30m / IRAM. Data obtained with the ALMA interferometer and NOEMA revealed that the SPIRE emission originates in some cases from several galaxies.These initial results are encouraging, but a study at other wavelengths (near infrared) is also needed to better constrain the content of our mass objects, and their star formation history. The data is already available on part of the smple, and analysis has begun
Sylla, François. „Accélération d'ions par interaction laser-plasma du régime sous-dense au régime proche sur-dense: effets de sillage et structures plasma associées“. Phd thesis, Ecole Polytechnique X, 2011. http://pastel.archives-ouvertes.fr/pastel-00710430.
Der volle Inhalt der QuelleGrouthier, Clément. „Récupération d'énergie et vibrations induites par vortex de structures flexibles“. Phd thesis, Ecole Polytechnique X, 2013. http://pastel.archives-ouvertes.fr/pastel-00875763.
Der volle Inhalt der QuellePerrin, Rodolphe. „Analyse physique et modélisation d'écoulements incompressibles instationnaires turbulents autour d'un cylindre circulaire à grand nombre de Reynolds“. Phd thesis, Toulouse, INPT, 2005. http://oatao.univ-toulouse.fr/7270/1/perrin1.pdf.
Der volle Inhalt der QuelleOttavy, Xavier. „Mesures par anémométrie laser dans un compresseur axial transsonique : Etude des structures instationnaires périodiques“. Ecully, Ecole centrale de Lyon, 1999. http://bibli.ec-lyon.fr/exl-doc/TH_T1804_xottavy.pdf.
Der volle Inhalt der QuelleA flow field analysis upstream of the rotor of the ECL4 transonic axial compressor, designed and built by SNECMA, has been made from the unsteady periodic results obtained with the L2F-2D anemometry technique. One objective of this work is to improve the applicability of L2f anemometry to high speed turbomachinery. Particular care has been paid to the improvement of the optical access. Curved glasses,which conform to the shroud contour, have been used in order to avoid any mismatch between the windows and the casing and to prevent any impact on the flow field. The resulting optical distortions of the control volume, which could hinder the acquisition of any data, have been corrected using an original and inexpensive optical assembly. The time dependant results are analyzed in the IGV-rotor inter-row. The aim of this analysis is, one the one hand, to improve our understanding of the unsteady flow phenomena. A study of the interaction between the IGV wakes and the shock waves emanating from the leading adge of the rotor blades proves the increase in magnetude of the wake passing through the moving shock. This result is highlighted by the streamwise evolution of the wake vorticiry. On the other hand the purely time-dependant velocity fluctuations which occur in the time averaging procedure, developed by Adamczyk, are quantified. It may be concluded that they are of the same order of magnitude as the spatial terms for the inlet rotor flow field. This shows that the temporal fluctuations should be considered for the 3D rotor time-averaged simulations
Duplantier, Stéphane. „Etude expérimentale d'un sillage confiné se développant en aval d'un corps d'arrêt : influence de la combustion sur la structure du sillage“. Poitiers, 1995. http://www.theses.fr/1995POIT2323.
Der volle Inhalt der QuelleJallas, Damien. „Stabilité d’écoulements de sillages périodiques générés par des ailes battantes“. Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30322.
Der volle Inhalt der QuelleThe thesis investigates numerically the stability of time-periodic wake flows generated by flapping wings and aims at explaining three phenomena that have been observed experimentally or simulated numerically : (i) the deviation of propulsive wakes behind a flapping wing with zero mean angle, (ii) the quasi-periodic flows around flapping wings with non zero mean angle, and (iii) the self-propulsion of heaving symmetric wings in a quiescent fluid. All these phenomena are related to the existence of instabilities of timeperiodic base flows. Original methods are developed to compute unstable time-periodic flows that satisfy the spatio-temporal symmetries imposed by the wings kinematics. The stability analysis of these time-periodic base flows are then determined by computing the Floquet multiplier and corresponding modes. In addition to the linear stability analysis, the knowledge of time-periodic base flows allows to investigate the non-linear saturation of these perturbations. In each case, the influence of the instabilities developing in the wake-flows on the flapping wing performances are discussed
Tchoufag, Joël. „Étude de la trajectoire d'objets en chute ou en ascension dans un fluide visqueux : une approche de stabilité globale“. Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2299/.
Der volle Inhalt der QuelleWe study the linear and weakly nonlinear global stability of the flow past axisymmetric ostacles such as cylinders and oblate spheroidal bubbles. These bodies are either considered held fixed or mobile under the effect of gravity in a Newtonian fluid otherwise at rest. A modal analysis is used to study the ``fixed" configuration in a parametric manner, varying the body aspect ratio and the Reynolds number. The wake instability is dominated by the helical modes |m|=1, followed up by the |m|=2 modes. The amplitude equations expressing the global modes interactions are derived and validated for thin disks up to the third bifurcation in the transition to chaos. A comparison with DNS shows qualitatively a good agreement. The instability core (wavemaker) and the critical regions most sensitive to an external modification (surfactants, etc) of the flow past a fixed bubble of frozen shape are identified through an adjoint approach. In the ``mobile" configuration, the stability analysis deals with the coupled system modes of the fluid+mobile object and shows non-trivial features of the stability branches among which frequency jumps and codimension-two bifurcation points. We show in particular that many trajectories directly result from the unstable global modes of the coupled system, rather than from the dynamics of the sole wake. A quasi-static approach in the high mass limit is used to establish the the connection with the "fixed" configuration. Last, the zigzag regime of disks and bubbles is proved to be satisfactorily modeled by a weakly nonlinear analysis, which particularly reveals the importance of the mean flow on the frequency
Achiq, Abderrahim. „Sur la structure en triple couche ; application à l'analyse du sillage en écoulement confiné“. Toulouse 3, 1992. http://www.theses.fr/1992TOU30043.
Der volle Inhalt der QuelleMougin, Guillaume. „Interactions entre la dynamique d'une bulle et les instabilités de son sillage“. Toulouse, INPT, 2001. http://www.theses.fr/2001INPT042H.
Der volle Inhalt der QuelleGuilcher, Pierre-Michel. „Contribution au développement d'une méthode SPH pour la simulation numérique des interactions houle-structure“. Nantes, 2008. http://www.theses.fr/2008NANT2065.
Der volle Inhalt der QuelleConstant, Eddy. „Développement d’un solveur de frontières immergées dans OpenFOAM : vers le contrôle des vibrations induites par vortex dans le sillage d’un cylindre“. Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0637/document.
Der volle Inhalt der QuelleThis thesis is related to the simulation and the control of the vortex induced vibrations phenomenon (VIV), which can result from the fluid structure interactions between an unsteady wake and the body, when the shedding frequency in the wake is close to the natural frequency of the body. The control of VIV is a critical issue when optimizing many systems. An Immersed Boundaries Method (IBM) was implemented into the PISO algorithm as a new library of OpenFOAM, in order to perform reliable simulations of incompressible flows around bluff bodies.To compute the divergence of the momentum equation and the interpolation of the fluxes, an hybrid calculation with an analytical resolution of the quantities involving the force term (singular quantities) has been proposed. The mesh convergence of several errors was shown by means of a manufactured solution, allowing to analyze both the errors irelated to the discretization and to the IBM. The new algorithm was subsequently extended to the RANS and DDES formalism proposed in OpenFOAM for the simulation of turbulent flows. A wall law was integrated into theIBM method to model the boundary layers that develop around the bodies at large Reynolds numbers. Various 2D and 3D well-documented test cases of academic flows around fixed or moving solid bodies (cylinderand sphere) have been simulated and carefully validated against existing data from the literature in a large range of Reynolds numbers. With the objective of developing optimal control laws for VIV, based on the linear instability mechanisms of the coupled system within the framework of the control theory, a new adjoint solver was also developed and validated in OpenFOAM
Arbie, Muhammad Rizqie. „Stability of self-propelled body wake“. Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4754/document.
Der volle Inhalt der QuelleThe caudal fin of swimming animals can be modelled as a thrust-producing flapping foil. When considered alone, such a foil produces on average a jet wake with a positive net momentum. It has been argued that the instability characteristics of these averaged wakes are linked to the propulsion efficiency of swimming animals. Here, we reconsider this question by taking into account both the thrust and the drag exerted on a self-propelled swimming body. To do so, we study the stability of a family of momentumless wakes, constructed as the Oseen approximation of a force doublet moving at constant velocity. By performing a local stability analysis, we first show that these wakes undergo a transition from absolute to convective instability. Then, using the time-stepper approach by integrating the linearised Navier-Stokes system, we investigate the global stability and reveal the influence of a non-parallel base flow as well as the role of the locally absolutely unstable upstream region in the wake. Finally, to complete the global scenario, we address the nonlinear evolution of the wake disturbance. These results are then discussed in the context of aquatic locomotion. According to the present stability results, the momentumless wake of aquatic animals is generally stable, whereas the corresponding thrust part is unstable. It is therefore essential to consider all forces exerted on a self-propelled animal when discussing its wake stability and its propulsion efficiency
Lahjomri, Jawad. „Caractérisation de la structure des sillages MHD amont et aval d'un cylindre à petit nombre de Reynolds magnétique“. Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37614873z.
Der volle Inhalt der QuelleLahjomri, Jawad. „Caractérisation de la structure des sillages M. H. D. Amont et aval d'un cylindre à petit nombre de Reynolds magnétique“. Grenoble 1, 1988. http://www.theses.fr/1988GRE10046.
Der volle Inhalt der QuelleGsell, Simon. „Vortex-induced vibrations of a rigid circular cylinder“. Phd thesis, Toulouse, INPT, 2016. http://oatao.univ-toulouse.fr/17430/1/gsell.pdf.
Der volle Inhalt der QuelleAubrée, Marc. „Analyse expérimentale du sillage et des efforts locaux produits par un écoulement uniforme sur une structure courbe de section circulaire : contribution à l'étude de la trainée des cables“. Le Havre, 1993. http://www.theses.fr/1993LEHA0006.
Der volle Inhalt der QuelleDourado, Wladimyr. „Développement d'une méthode instationnaire de calcul sur maillages hybrides non structurés d'écoulements turbulents à faible nombre de mach : application au calcul d'une flamme plane turbulente et d'écoulements turbulents de sillages inertes et réactifs“. Poitiers, 2003. http://www.theses.fr/2003POIT2357.
Der volle Inhalt der QuelleLemaitre, Cécile. „Dynamique d'un film d'eau de pluie sur un hauban de pont soumis au vent“. Phd thesis, Ecole Polytechnique X, 2006. http://pastel.archives-ouvertes.fr/pastel-00003072.
Der volle Inhalt der QuelleRandrianantenaina, Cyriaque Donat. „Contribution à l'étude expérimentale des écoulements confinés à surfaces libres : application à l'interaction fluide-structure dans un compartiment de JIG artisanal“. Thesis, Le Havre, 2016. http://www.theses.fr/2016LEHA0033/document.
Der volle Inhalt der QuelleThe work realized under this co-supervised thesis concerns two study areas of fluid-structure interaction. The first concerned the Mineral Engineering and deals with the interaction between a moving grate in a sluice and the confined flow associated. The second concerns the fundamental Hydrodynamics and deals with the interaction of a cylinder mounted on flexible supports and a free surface flow in presence of plane wall. Our work contributes to the study a confined free surface flow by experimental approach. We coupled techniques of CCD camera visualization, velocity fields measurements by PIV and hydrodynamic forces to qualify the dynamics of structure motion in the flow. Experimental methods and devices are applied to the study the flow around two simplified models of a moving JIG grate and then to study a vibrating cylinder due to flow. Treatments of PIV data acquisitions by multivariable statistical POD enabled us to describe evolution of recirculation zones in the compartment and unsteady velocity field. Experimental study was completed by a numerical simulation of Jig model by using ANSYS14.5 and a numerical wake oscillator model for the case of the cylinder. This work highlighted a simple technique to give motion, in a sluice, a attached net to a cylinder and to study effects of free surface flow confinement on a vibrating cylinder
Herry, Benjamin. „Etude aérodynamique d'une double marche descendante 3D appliquée à la sécurisation de l'appontage des hélicoptères sur les frégates“. Phd thesis, Université de Valenciennes et du Hainaut-Cambresis, 2010. http://tel.archives-ouvertes.fr/tel-00650410.
Der volle Inhalt der QuelleCosta, Sylvain. „Développement d'un récupérateur d'énergie oscillant“. Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2019. http://www.theses.fr/2019ESMA0011/document.
Der volle Inhalt der QuelleEnergy harvesting is a common process presents in so many ways in nature. Fishes and birds use for example their surroundings in order to produce propulsion without any effort. The focus of this thesis is to design a hydro-aéro-elastic harvester based on these dynamics. The fluid-structure interaction is introduced to explain the energy supply of the concept. An oscillating-wing-mechanism is theoretically and numerically developed in the aim to investigate the behavior of the marine-wind turbine. The energetic efficiency is then maximized by the asymmetric oscillations relative to the fluid-structure coupling. Note that the non-symmetric characteristic of the oscillation is included in the theory of Couchet which completes the unsteady aerodynamic theory of Theodorsen. Unusual high performances of the oscillating harvester suggest some apprehensions reading the efficiency’s definition. Indeed, the hydro-aéro-elastic harvester optimization can be achieved ether by increasing the power output or by decreasing the power available in the fluid artificially modified by the sweep section of the foil. These uncertainties are resolved by considering another definition of the energetic efficiency which is developed according to the theory of Couchet. The performance analysis of the new factor presents the contribution of the wake induced by the asymmetric oscillation of the foil on the energy harvesting quantities